ATL / WTL / STL

Re: detect multiple instances of an application

10-Dec-12 13:38

Yes, that is a good article. I just wanted to know how many copies have already been started so the code could avoid putting all the opwninf dialogs on top of each other. I will elect to not add that complexity and let the user deal with it.
Thanks for taking the time to reply.

Thanks for your time

H.Brydon31-Dec-12 20:09

H.Brydon

31-Dec-12 20:09

If you want to be able to count instance hits, have a look at the shared memory option here.[^]

This article also shows some other techniques which I think fix some of the problems described in Joe Newcomer's article first referenced above. I have used the shared memory technique to inhibit multiple instances of a program as well as manage some common data in a program where I allow multiple instances.

[I have a lot of respect for the technical output of both of these authors.]

--
Harvey

Open file in basic MFC app

bkelly135-Dec-12 14:45

Re: Open file in basic MFC app

5-Dec-12 14:45

Visual Studio 2008, Windows 7
I create the basic MFP application with Single or Multiple documents, then immediately compile and run it. Using the File -> Open option I can navigate to and open a file.

However, when looking through the code I do not recognize any variable that might be the handle to a file. How do I acces that file I just opened?

Thanks for your time

Richard MacCutchan5-Dec-12 21:24

Re: Open file in basic MFC app

5-Dec-12 21:24

It's a while since I used MFC but I think the actual handle is held internally by the CDocument object. When you open the file the framework should call your OpenFile() method (I think that's its name) and you then load the data from the file using the CArchive object. The skeleton code should be there in your document class.

One of these days I'm going to think of a really clever signature.

bkelly139-Dec-12 11:36

Re: Open file in basic MFC app

9-Dec-12 11:36

A search for OpenFile returned nothing. I looked around for CDocument and CArchive but did not recognize anything that looked like code to open a file.

Thanks for your time

Richard MacCutchan9-Dec-12 21:36

9-Dec-12 21:36

I don't know where you were looking, but MSDN details CDocument::OnOpenDocument[^] and CArchive::Read[^] along with all the various other member functions of each class.

One of these days I'm going to think of a really clever signature.

the answer is

bkelly139-Dec-12 12:25

How To Use Macro In dsp file(VC6.0 *.dsp file)

9-Dec-12 12:25

Override OnOpenDocument, in the CDocument class. That function will be called with the selected file path. You would normally open and read the file there.
This answer was courtesy MSDN forums.

Thanks for your time

yingkou27-Nov-12 14:37

yingkou

27-Nov-12 14:37

I want to use macro in .dsp file for load different file to workspace,just as below:

123 is a sub-folder of 04 project folder and there is a 04.rc and resource.h

!IF "$(CFG)" == "04 - Win32 Release"
RCF=..\\123\\04.rc

RCH=..\\123\\Resource.h

!ELSEIF "$(CFG)" == "04 - Win32 Debug"
RCF=..\\123\\04.rc
RCH=..\\123\\Resource.h

!ENDIF

# Begin Target

...

# Begin Source File
SOURCE=RCF
# End Source File

Begin Source File
SOURCE=RCH
# End Source File

# End Target

Open workspace by VC6 IDE, RC is not loaded and RCF and RCF are display as a file name in workspace but empty，why？how should I do for doing this work well。
Change macro definition as below,result is same

RCF=.\123\04.rc
RCH=.\123\Resource.h

Re: How To Use Macro In dsp file(VC6.0 *.dsp file)

Richard MacCutchan27-Nov-12 23:34

AccessibleObjectFromWindow returns E_ACCESSDENIED

27-Nov-12 23:34

The results of both parts of your !IF expression are the same. I have not used VC6 for many years, but the later versions need some other function to copy the source file to the project directory. Take a look at how the other files are handled.

One of these days I'm going to think of a really clever signature.

BCN-16325-Nov-12 23:04

BCN-163

25-Nov-12 23:04

I called

C++

AccessibleObjectFromWindow(hPDFDoc, OBJID_NATIVEOM, IID_IDispatch, (void**)&pDisp );

to get an interface to access PDF files. but in xp it returns an error E_ACCESSDENIED. when in win7 it works fun. I guess that I didn't have enough authority.
I tried some setting on my computer, but all failed, I really have no more idea of this.
Any tip would be great helpful.

How to use NTGraph3D Activex Control in Visual Studio 2010.

DhrumilS23-Nov-12 0:44

DhrumilS

23-Nov-12 0:44

Visual Studio C++ provides facility for using ActiveX control in VC6.0 as well as in VC2010. I tried NTGraph3D activeX Control in VC6.0. It is working perfectly.

I tried the same in VC 2010. So for Visual Studio 2010, NTGraph3D ActiveX Control is not working.

So can anyone help me to solve this problem. Is there any change in properties ?

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copying AAComBSTR to BYTE

V K 220-Nov-12 20:56

V K 2

20-Nov-12 20:56

Can anybody help me in copying AAComBSTR to BYTE. Is there any API available which does this copy.

Your help is appreciated.

Re: copying AAComBSTR to BYTE

Richard MacCutchan20-Nov-12 21:28

Re: copying AAComBSTR to BYTE

20-Nov-12 21:28

Try CComBSTR::BSTRToArray()[^].

One of these days I'm going to think of a really clever signature.

hacker240union22-Nov-12 23:27

hacker240union

22-Nov-12 23:27

C++ Delegate/Events

EDanaII14-Nov-12 17:15

EDanaII

14-Nov-12 17:15

Greetings,

I just recently started some experiments with C++. I'm an experienced programmer, but not with C++, but, just for fun, I decided to implement this example C++ Delegate here on Code Project.

This example keeps the methods hooked into the delegate inside structs. In the example given these are: struct TShapes, struct TDerivedShapes and struct TThings. These are then initialized in this fashion: event += new MyEvent::T<tshapes>(&shapes, &TShapes::Square);

My question is this: is it necessary to store the methods to be hooked into these events into a struct? I assume this is done because the struct makes the address available to be used in the delegate. If the answer to this question is no, then how do you hook into the even just through standard methods within a normal C++ program? Please forgive the stupidity of my questions. Smile | :)

Ed.

Richard MacCutchan14-Nov-12 20:57

14-Nov-12 20:57

Take a look at function pointers[^].

One of these days I'm going to think of a really clever signature.

EDanaII15-Nov-12 13:35

EDanaII

15-Nov-12 13:35

Well, thanks, but that's not quite what I asked. Smile | :)

I was wondering if it was required to embed your methods in a struct for the example identified. If by your response you meant "yes, they must be embedded" then an explicit answer would be appreciated.

Thanks again.

Ed.

Richard MacCutchan15-Nov-12 23:45

15-Nov-12 23:45

Edward G Dana wrote:
Well, thanks, but that's not quite what I asked.

Sorry, I misunderstood. But I think your question should really be directed at the author of the article.

One of these days I'm going to think of a really clever signature.

pasztorpisti20-Nov-12 2:53

pasztorpisti

20-Nov-12 2:53

C++ doesn't natively support delegates and delegate implementation in C++ is quite messy especially if you try to support methods with variable number of parameters and parameter types - it also involves super-ugly method pointer casting. Delegates are simply ugly in C++, I recommend never using them if it isn't necessary. (For me using delegates is necessary only if a used 3rd party library makes it necessary to use delgates in its public interface...) I always prefer using old-school listener interfaces with old-school virtual methods (classes with pure or empty-bodied virtual methods only) to listen for events. Always consider alternatives and prefer readability of the resulting code. It doesn't worth trying to shape C++ into C#!